Does this model HELOC principal paydown?

No. For simplicity and to highlight rate risk, the HELOC in this calculator is modeled as interest-only on the drawn amount over the chosen horizon. In reality, you can often pay down principal at any time, which would reduce your actual interest cost faster than shown.

What about HELOC draw and repayment periods?

Many HELOCs have a draw period followed by a repayment period with amortizing payments. This tool does not simulate that structure; instead, it assumes a constant outstanding draw during the horizon you select. If you expect to pay the line down earlier, consider using a shorter horizon.

Are taxes and insurance included?

No. The calculations focus on principal and interest only. Property taxes, homeowners insurance, mortgage insurance, and other escrow items are not included and should be considered separately in your budget.

Can the draw exceed LTV capacity?

The modeled draw is capped by your max LTV limit after accounting for your current balance and closing costs. If you request more than your equity supports, the calculator will automatically limit the draw to what appears feasible under that LTV.

What if rates change after I open a HELOC?

HELOC rates are variable and can change frequently. To account for this, you can run scenarios with higher HELOC APRs to see how much more interest you might pay if rates move up. For precise projections, ask your lender how your rate is indexed and how often it can adjust.

finance calculator

HELOC vs Cash-Out Refi Calculator

Compare taking cash from your home via a HELOC versus a cash-out refinance, including payments and interest over a chosen horizon.

Results

Max loan at LTV: $400,000
Cash available at max LTV: $76,000
Draw modeled: $50,000
Cash-out monthly payment (P&I): $2,364
Current mortgage payment (P&I): $2,076
Payment change (cash-out vs current): $288
HELOC interest-only payment: $333
HELOC interest over horizon: $20,000
Cash-out interest over horizon: $117,941
Current loan + HELOC interest over horizon: $124,933
Interest difference (HELOC scenario − cash-out): $6,992

Overview

Decide between a HELOC and a cash-out refinance by comparing payments and interest over a chosen horizon for the cash you need. Both options tap your home equity, but they behave very differently once the money is in your hands. A cash-out refi replaces your existing mortgage with a larger fixed-rate loan, while a HELOC usually acts as a separate, variable-rate line of credit with interest-only payments during the draw period.

This calculator puts both paths on the same timeline so you can see, over the next few years, how much each choice may cost in monthly payments and total interest. Instead of just reacting to teaser rates or marketing pitches, you can look at actual dollar differences based on your home value, loan balance, draw amount, and time horizon.

How to use this calculator

Enter your home value, current mortgage balance, current rate, original term, and how many months have elapsed on the existing loan so far.
Enter your max LTV percentage, desired cash draw, expected cash-out closing costs, and the cash-out refi’s rate and term.
Enter a HELOC interest rate and your comparison horizon in years—that is, how long you expect to keep this extra debt before paying it back, selling, or refinancing again.
Run the calculation to see how much cash is available under your LTV limit, what draw amount the model uses, and the monthly payment for the cash-out refi vs your current mortgage.
Review the HELOC interest-only payment, projected interest over the horizon for both scenarios, and the interest difference number to understand which path appears cheaper or more flexible over that time frame.
Experiment by changing the horizon, HELOC rate, or cash-out APR to stress-test how sensitive your decision is to rate changes or a shorter payoff plan.

Inputs explained

Max LTV: The maximum loan-to-value ratio your lender or program allows after the transaction. A typical conventional cash-out cap is 80%, but some programs vary. This limit constrains how much equity you can tap through a new mortgage.
Draw amount: The cash you want to pull out of your home, before closing costs. If your requested draw exceeds what the LTV limit allows once costs are included, the calculator will cap the modeled draw at the maximum available.
Horizon: How long you expect to keep this additional debt outstanding. A shorter horizon (for example, 3–7 years) focuses the comparison on the near term, which is often more relevant if you plan to move, refinance again, or aggressively repay the balance.
HELOC rate: The interest rate on your home equity line of credit. HELOCs are typically variable, so the rate you enter should reflect your expectations (or a stressed, higher rate) rather than just today’s promotional quote. Payments are modeled as interest-only over the selected horizon.

How it works

We first calculate your maximum cash-out capacity based on your home value and a maximum loan-to-value (LTV) limit. Max loan at LTV = home value × (LTV% ÷ 100). Cash available at max LTV is that maximum loan minus your current balance and estimated closing costs.

Your requested draw amount is then capped at the cash available at max LTV. If you ask for more cash than the LTV limit allows, the calculator will model only the amount you can realistically access under that limit.

For the cash-out refinance scenario, the new mortgage balance equals current balance + modeled draw + closing costs. We apply the cash-out APR and term to compute a new principal-and-interest (P&I) payment and estimate interest paid over your chosen comparison horizon.

We also keep track of your current mortgage payment and estimate its interest over the same horizon so you can see how replacing the loan changes both monthly outflow and interest cost.

For the HELOC scenario, we leave your existing mortgage in place and model the HELOC as interest-only: monthly interest ≈ draw × (HELOC APR ÷ 12). We estimate interest over the horizon by combining your current loan’s interest with interest-only charges on the HELOC draw.

Finally, we compare the two paths: payment change between the current mortgage and a cash-out refi, HELOC interest-only payment, and total interest over the horizon in each scenario. The interest difference line shows whether carrying a HELOC plus your existing loan is projected to cost more or less than a single cash-out mortgage over the period you care about.

Formula

Max loan at LTV = Value × (LTV% ÷ 100)
Cash available = Max loan at LTV − Balance − Costs
Cash-out payment uses standard amortization: Payment = P × r / (1 − (1 + r)^{−n}), where P = new principal (balance + draw + costs), r = APR/12, n = term months
HELOC interest-only payment ≈ Draw × (HELOC APR ÷ 12)
Horizon interest is estimated by summing monthly interest under each scenario over the chosen horizon.

When to use it

Comparing fixed-rate cash-out versus variable-rate HELOC for renovation funds, debt consolidation, tuition, or other large expenses.
Checking the payment impact of rolling your existing mortgage and new cash into a single larger loan versus keeping your first mortgage and adding a HELOC on top.
Evaluating whether a HELOC’s flexibility and lower upfront costs are worth potentially higher interest over several years, especially if you only need the money for a short time.
Estimating how much rising HELOC rates could affect your costs by re-running the calculator with higher HELOC APR assumptions.
Stress-testing different horizons—for example, a likely five-year stay in the home versus a longer ten-year horizon—to see how your decision might change if you stay put longer than expected.

Tips & cautions

Remember that HELOCs are typically variable-rate products. If rates rise, your interest-only payment and total interest cost can climb quickly. Use a rate that reflects a realistic or even slightly pessimistic scenario, not just today’s teaser.
Cash-out refinances usually carry higher closing costs than HELOCs. Make sure you include realistic estimates for fees so the total cost of the refi is properly reflected in your comparison.
If you expect to pay down the HELOC aggressively rather than making interest-only payments, your real HELOC interest cost will be lower than the model assumes. You can approximate this by entering a shorter horizon that matches your payoff plan.
Think about non-numeric factors too: a single fixed-rate mortgage may feel simpler and more predictable, while a HELOC can provide ongoing access to a line of credit for future projects.
Talk with your lender or advisor about how each option affects things like mortgage insurance, tax deductions, and refinancing flexibility in the future, and then use this calculator to put those trade-offs into numbers.
Models the HELOC as interest-only over the comparison horizon and does not simulate principal paydown schedules, draw periods, or repayment periods that are common in real HELOC products.
Assumes constant interest rates for both the HELOC and the mortgages. Actual HELOC rates are typically variable and may change multiple times during your horizon.
Closing costs are treated as a single upfront amount added to the cash-out loan; additional lender fees, points, or third-party charges may not be fully captured.
The model does not include property taxes, homeowners insurance, mortgage insurance, or potential tax deductions. It focuses on principal and interest only.
All figures are estimates based on the inputs you provide and standard amortization math. Real offers, underwriting limits, and product structures vary by lender and jurisdiction.

Worked examples

$500k value, $320k balance, 80% LTV, need $50k, 6.5% cash-out vs 8% HELOC, 5-year horizon

Max cash available ≈ $76k (after $4k costs); modeled draw = $50k
Cash-out P&I ≈ $2,364 (vs current $2,076), interest over 5 years ≈ $117,941
HELOC interest-only ≈ $333/mo; 5-year interest (current + HELOC) ≈ $124,933
Interest difference ≈ $6,992 favoring cash-out over 5 years
In this scenario the cash-out refi costs more each month but saves several thousand dollars in interest over the 5-year horizon compared to keeping the current mortgage and adding a HELOC.

$650k value, $410k balance, need $80k, 6% cash-out vs 9% HELOC, 5-year horizon

Max cash available ≈ $105k (after $5k costs); modeled draw = $80k
Cash-out P&I ≈ $2,968 (vs current $2,700), interest over 5 years ≈ $143,686
HELOC interest-only ≈ $600/mo; 5-year interest (current + HELOC) ≈ $173,540
Interest difference ≈ $29,854 favoring cash-out over 5 years
Here the higher HELOC rate makes the interest-only path much more expensive over five years, even though the HELOC offers more flexibility with when and how you pay principal.

Short-term project with aggressive HELOC paydown

You plan a 2-year renovation and expect to repay the HELOC quickly after selling another asset.
You set the horizon to 2 years and model a HELOC at a slightly stressed rate to see the worst-case interest cost if you only pay interest during that time.
The comparison shows that, over a short 2-year horizon, sticking with your current mortgage and using a HELOC may cost less in total interest and avoid resetting your 30-year mortgage clock.

Deep dive

This HELOC vs cash-out refinance calculator compares monthly payments and interest over a custom time horizon so you can see which way of tapping home equity may cost less.

Enter your home value, current mortgage details, LTV limit, desired cash draw, closing costs, and rates to quantify the trade-offs between a fixed-rate cash-out refi and a variable-rate HELOC.

Use the results to stress-test different horizons and rate scenarios before you commit to a new loan structure, especially if you expect to move, renovate, or refinance again within a few years.

Because the tool models both scenarios side-by-side, it pairs well with conversations with lenders or financial advisors and helps you ask more precise questions about fees, rate risk, and flexibility.

FAQs

Does this model HELOC principal paydown?: No. For simplicity and to highlight rate risk, the HELOC in this calculator is modeled as interest-only on the drawn amount over the chosen horizon. In reality, you can often pay down principal at any time, which would reduce your actual interest cost faster than shown.
What about HELOC draw and repayment periods?: Many HELOCs have a draw period followed by a repayment period with amortizing payments. This tool does not simulate that structure; instead, it assumes a constant outstanding draw during the horizon you select. If you expect to pay the line down earlier, consider using a shorter horizon.
Are taxes and insurance included?: No. The calculations focus on principal and interest only. Property taxes, homeowners insurance, mortgage insurance, and other escrow items are not included and should be considered separately in your budget.
Can the draw exceed LTV capacity?: The modeled draw is capped by your max LTV limit after accounting for your current balance and closing costs. If you request more than your equity supports, the calculator will automatically limit the draw to what appears feasible under that LTV.
What if rates change after I open a HELOC?: HELOC rates are variable and can change frequently. To account for this, you can run scenarios with higher HELOC APRs to see how much more interest you might pay if rates move up. For precise projections, ask your lender how your rate is indexed and how often it can adjust.

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This HELOC vs cash-out refinance comparison is an educational estimate based on the numbers you enter and simplified assumptions about how each loan type behaves. It does not capture every product feature, fee, tax implication, or rate change, and it is not financial, tax, or legal advice. Real HELOC and mortgage terms, closing costs, LTV limits, and underwriting standards vary widely by lender and location. Always review official loan disclosures carefully and consult a qualified professional before making decisions about borrowing against your home.